int  Search_Bin(SSTable T, KeyType k)
{
	int low = 1, high = T.length;
	while (low <= high)
	{
		int mid = (low + high) / 2;
		if (k < T.R[mid].key)
		{
			high = mid - 1;
		}
		else if (k > T.R[mid].key)
		{
			low = mid + 1;
		}
		else
		{
			return mid;
		}
	}
	return 0;
}